No Adblue coming Through Injector or Present in Pipe

[Ding009]

Good evening All

Currently have a 2015 CLS 220D Shooting Brake, and have a few issues linked to Nox/Adblue.

I fully appreciate this topic is a common one on this Forum, and been discussed many times, but hoping my investigation and questions are a bit different.

So, where to start. Having had the infamous engine light, followed by the Adblue warning, and 500mile countdown, I began my investigation. Firstly I took off the adblue injector, and cleared off all of the adblue crystallisation. Returned it to the car, but the problem persists.

Although I had topped up the adblue, it was probably around 2/3 full, so topped it up. Still same problem.

I attempted to take off the nox sensors, but upon giving it quite a bit of torque, I decided to go no further as concerned I may sheer them off. May return to this, if others feel it necessary.

I took the adblue injector off again, and this time removed it from the pipe. To my surprise, even though the tank was full, no adblue was present in the pipe at all. I subsequently tested the injector by using a 9v battery just to see if the injector would click and present as working, which it did.

I then went to the rear of the car, removed the plastic cover, and removed the adblue pipe from the pump. Yet again, absolutely no Adblue present at all, although the tank being full. This of course leads me to a couple of ideas, but would really appreciate any similar experiences.

First idea, the pump/heater has packed up, and not pumped anything into the pipe for some time, hence it being bone dry?

Second idea, the pump/heater has crystalised to the point of not letting anything through. Not sure how clogged the crystals can make it, but suppose possible?

Final idea (for me anyway), the electrical feed to the pump is faulty, thus presenting the same issue as if the pump wasn't working?

Has anyone investigated and had similar experiences? What else di you do? How could I narrow down my investigation any further without biting the bullet and replacing the tank, pump or both? And can the pump be bought separately from the tank on the model? Keep reading it is a single unit, but there is enough bolts in the bottom to suggest it is removeable.

Sorry for the long message, and really would appreciate some direction to get this finally across the line.

Thank you

 

[dry run]

I hope you find a solution - and please post back here if you do.

My solution has always been to take it to a trusted indy and let them diagnose it and fix it. I know that can be painful on the wallet, but for me life's too short

 

[Wighty]

This thread might help you buddy

w213 adblue pump and engine not start

Could it be that the AdBlue system in my car was programmed by the previous owner, and now, for some reason, it's throwing an error? I keep clearing the error, and I've already driven about 2,000 km without any notifications that you have left a certain distance before engine not start. The...

forums.mercedesclub.org.uk

 

[Wighty]

Also have a look into the “anti crystal additives “that you can add to the tank

 

[Ding009]

This thread might help you buddy

w213 adblue pump and engine not start

Could it be that the AdBlue system in my car was programmed by the previous owner, and now, for some reason, it's throwing an error? I keep clearing the error, and I've already driven about 2,000 km without any notifications that you have left a certain distance before engine not start. The...

forums.mercedesclub.org.uk

Thank you, will take a look

 

[Trev1964]

Adblue, spawn of the devil.
This is exactly why I bought a pre adblue car.
Good luck with it mate.

 

[Ding009]

I hope you find a solution - and please post back here if you do.

My solution has always been to take it to a trusted indy and let them diagnose it and fix it. I know that can be painful on the wallet, but for me life's too short

In the current climate, my concern is how high the bill would get before an actual resolution. I don't mind throwing some money at this in order to resolve. But when reading through these, I regularly read repeated visits back to the garage in order to resolve, and my wallet at present can not sustain that.

 

[rf065]

Life's too short, remap with adblue delete and forget all about it.

 

[supernoodle]

The adblue pumps can run both directions. When you key off the fluid is evacuated from the line and returned to the tank, this is to prevent any possibility of it freezing in the line.

I know the same Bosch SCR system on other vehicles have service routines to prime the system and a dosing tests that will activate the pump and open the injector to deliver a prescribed amount of fluid. I expect Xentry should offer such tests.

 

[Ding009]

Adblue, spawn of the devil.
This is exactly why I bought a pre adblue car.
Good luck with it mate.

Thank you

The adblue pumps can run both directions. When you key off the fluid is evacuated from the line and returned to the tank, this is to prevent any possibility of it freezing in the line.

I know the same Bosch SCR system on other vehicles have service routines to prime the system and a dosing tests that will activate the pump and open the injector to deliver a prescribed amount of fluid. I expect Xentry should offer such tests.

Hi,

Thank you for the response.

Even with the adblue evacuating from the tank, would you then not expect the adblue to flow upon starting the car? I had nothing at the Cat end when I removed the injector, and started the car. And likewise when I removed the pipe from the pump, nothing at all was present at the exit of the pump. Surely something would trigger or push some out? Or am I missing something?

Thank you

 

[Wighty]

Thank you

Hi,

Thank you for the response.

Even with the adblue evacuating from the tank, would you then not expect the adblue to flow upon starting the car? I had nothing at the Cat end when I removed the injector, and started the car. And likewise when I removed the pipe from the pump, nothing at all was present at the exit of the pump. Surely something would trigger or push some out? Or am I missing something?

Thank you

Has the adblue been mapped out before you bought it ?

 

[supernoodle]

Thank you

Hi,

Thank you for the response.

Even with the adblue evacuating from the tank, would you then not expect the adblue to flow upon starting the car? I had nothing at the Cat end when I removed the injector, and started the car. And likewise when I removed the pipe from the pump, nothing at all was present at the exit of the pump. Surely something would trigger or push some out? Or am I missing something?

Thank you

Well @Wighty 's question is valid. Is it a recent purchase or a dodgy remap?

If that's not the case, the fact you say you have the MIL on and are in inducement(countdown) means that a error has been detected. It is quite likely that the software has been intentionally deactivated the system as a reaction to that fault. You need to plug in to a diag tool and see what the fault is and rectify.

 

[Ding009]

I do not believe it has been mapped out before, but could be wrong.

Had the car since 2019, and been topping up the Adblue sporadically, and this has occasionally been due to the request to actually add it. Would that request still appear if it had been mapped out?

In addition to the Adblue countdown, I'm also getting the Nox Sensor fault code, which again would surely not appear under a map out?

Codes present are:-
P13E4(00)
P13F6(00
P229F(09)
Occasional - P1BC3(00)

Thanks

 

[supernoodle]

Well not mapped out then, but you have faults relating to NOx sensor and inducement.

The NOx sensors are an intrinsic part of the SCR system, so with those faults the SCR system won't operate. There is no point injecting the adblue if it can't determine the efficacy of the NOx conversion because the sensor is bad.

This is a standard strategy in control systems, if an error is detected in a component, systems that rely on it can be intentionally disabled so you don't get undesired behaviour or possible damage.